Mondo Description A rare syndrome caused by deletion of genetic material in the short arm of chromosome 17. It is characterized by an abnormally smooth brain with fewer folds and grooves. It results in intellectual disability, developmental delay, seizures, spasticity, hypotonia, and feeding difficulties. Affected individuals have distinctive facial features that include a prominent forehead, midface hypoplasia, small, upturned nose, low-set ears, small jaw, and thick upper lip.

Uniprot Description A contiguous gene deletion syndrome of chromosome 17p13.3, characterized by classical lissencephaly and distinct facial features. Additional congenital malformations can be part of the condition.

Disease Ontology Description A syndrome characterized by classical lissencephaly and distinct facial features. Visible and submicroscopic deletions of 17p13.3, including the LIS1 gene, are found in almost 100% of patients.